實現socket的監聽方法

• 使用c語言
• 使用CocoaAsyncSocket框架(內部對C的封裝)
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1.創建命令行工程

命令行工程.png

2.集成CocoaAsyncSocket

如果您已經熟練使用CocoaPods，請忽略此點
1.導入框架文件

TCP:UDP.png

如果編譯出現

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_GCDAsyncSocket", referenced from:
      objc-class-ref in LKLScoketService.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

解決辦法

添加文件.png

自定義socket服務對象

.h文件

#import <Foundation/Foundation.h>
#import "GCDAsyncSocket.h"
@interface LKLSocketService : NSObject
//開啟服務
- (void)start;
@end

.m文件

#import "LKLSocketService"
@interface LKLSocketService ()<GCDAsyncSocketDelegate>
@property (strong, nonatomic) GCDAsyncSocket *socket;
@property (strong, nonatomic) NSMutableArray *clientSockets;//保存客戶端scoket
@end
@implementation LKLSocketService
- (NSMutableArray *)clientSockets
{
    if (_clientSockets == nil) {
        _clientSockets = [[NSMutableArray alloc]init];
    }
    return _clientSockets;
}

- (void)start
{
    //1.創建scoket對象
    GCDAsyncSocket *serviceScoket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_global_queue(0, 0)];

    //2.綁定端口(5288)
   //端口任意，但遵循有效端口原則范圍：0~65535，其中0~1024由系統使用或者保留端口，開發中建議使用1024以上的端口
    NSError *error = nil;
    [serviceScoket acceptOnPort:5288 error:&error];

    //3.開啟服務(實質第二步綁定端口的同時默認開啟服務)
    if (error == nil)
    {
        NSLog(@"開啟成功");
    }
    else
    {
        NSLog(@"開啟失敗");
    }
    self.socket = serviceScoket;
}

#pragma mark GCDAsyncSocketDelegate
//連接到客戶端socket
- (void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket
{
    //sock 服務端的socket
    //newSocket 客戶端連接的socket
    NSLog(@"%@----%@",sock, newSocket);

    //1.保存連接的客戶端socket(否則newSocket釋放掉后鏈接會自動斷開)
    [self.clientSockets addObject:newSocket];

    //連接成功服務端立即向客戶端提供服務
    NSMutableString *serviceContent = [NSMutableString string];
    [serviceContent appendString:@"話費查詢請按1\n"];
    [serviceContent appendString:@"話費充值請按2\n"];
    [serviceContent appendString:@"投訴建議請按3\n"];
    [serviceContent appendString:@"最新優惠請按4\n"];
    [serviceContent appendString:@"人工服務請按0\n"];
    [newSocket writeData:[serviceContent dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];

    //2.監聽客戶端有沒有數據上傳
    //-1代表不超時
    //tag標示作用
    [newSocket readDataWithTimeout:-1 tag:0];
}

//接收到客戶端數據
- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
    //1.接受到用戶數據
    NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSInteger code = [str integerValue];
    NSString *responseString = nil;
    switch (code) {
        case 1:
            responseString = @"您的賬戶余額為0，請盡快充值\n";
            break;
        case 2:
            responseString = @"系統忙，請稍后重試\n";
            break;
        case 3:
            responseString = @"系統忙，暫時不能接受投訴建議\n";
            break;
        case 4:
            responseString = @"請上官網查看更多優惠\n";
            break;
        case 0:
            responseString = @"客服忙，謝謝!\n";
            break;
        default:
            break;
    }
    //處理請求 返回數據
    [sock writeData:[responseString dataUsingEncoding:NSUTF8StringEncoding] withTimeout:-1 tag:0];
    if (code == 0) {
        [self.clientSockets removeObject:sock];
    }
    //CocoaAsyncSocket每次讀取完成后必須調用一次監聽數據方法
    [sock readDataWithTimeout:-1 tag:0];
}

開始Socket服務

main.m文件

#import <Foundation/Foundation.h>
#import "LKLSocketService.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"Hello, World!");
        //創建服務對象
        LKLSocketService *socketSerview = [[LKLSocketService alloc]init];
        //開始服務
        [socketSerview start];
        //循環運行
        [[NSRunLoop mainRunLoop]run];//目的讓服務器不停止
    }
    return 0;
}

終端模擬客戶端

終端.png

使用Telnet命令telnet host port/telnet 192.168.10.10 5288
telnet命令是連接服務器上的某個端口對應的服務

• 通信

  
  
  通信.png
  
  

  Connection closed by foreign host.//斷開連接